Use assert_flavor_equal to check flavor before and after microversion 2.46
Use assert_flavor_equal to check flavor before and after microversion 2.46

Flavor id is not returned in the server response after microversion 2.46,
but we can use base.assert_flavor_equal to check flavor before and after
microversion 2.46.

Change-Id: If04005a3ff5ef4b1faa4d2179ba2987abdd5ef04

masayukig/tempest,openstack/tempest,cisco-openstack/tempest,cisco-openstack/tempest,masayukig/tempest,openstack/tempest